KVM: VMX: replace vmx_spec_ctrl_restore_host with RESTORE_HOST_SPEC_CTRL_BODY

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Reuse the same assembly as SVM, just with alternatives instead
of cpu_feature_enabled(X86_FEATURE_KERNEL_IBRS).

Note that Intel does need an LFENCE with eIBRS, unlike AMD's AutoIBRS.
However, it is not needed for X86_FEATURE_KERNEL_IBRS because there
are no conditional branches between FILL_RETURN_BUFFER and ret.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Paolo Bonzini 2026-04-08 04:39:20 -04:00

parent 85c2905096

commit 344ebd21f2

4 changed files with 29 additions and 34 deletions

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9

arch/x86/kvm/vmenter.h

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28

arch/x86/kvm/vmx/vmenter.S

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25

arch/x86/kvm/vmx/vmx.c

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1

arch/x86/kvm/vmx/vmx.h

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